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Thanks, this is useful. I am thinking about building a UPS at home from batteries, so it can supply around 650W of DC power. I assume that using voltage of 12V

by effie 7y ago

Thanks, this is useful. I am thinking about building a UPS at home from batteries, so it can supply around 650W of DC power. I assume that using voltage of 12V on the supply side of the DC-DC converter would be too energy-inefficient for such high a power, so I'm thinking I'd better string such 12V batteries in series to get higher voltage, say 300 V. This should have minimal transmission losses, so I can lead this to my DC-DC converter via standard electric wires.

ChuckMcM 7y ago
Most of the mid-range UPS systems that are rated at 650KVA or above will use dual 12V batteries for 24V driving an inverter. You can get 1kW inverters for RV's but they need thick (0 gage) wires connected to the battery. For "universal" battery power (and lots of gear in the market already) consider 48V power. That has been the standard at phone companies for decades so there is a lot of support for it. I once bid on a 10kW 48V inverter on eBay that had been removed from service at a phone company. It made (240V two phase power for telephone racks).